Operational Check

Operational Check
The purpose of the operational check is to confirm that the system operates properly.
Conditions : Engine running and at usual operating temperature




CHECKING BLOWER
1. Turn fan control dial to 1st speed. Blower should operate on low speed.
2. Turn fan control dial to 2nd speed, and continue checking blower speed until all speeds are checked.
3. Leave blower on MAX speed.

If NG, go to trouble diagnosis procedure for ATC-75, "Blower Motor Circuit". Blower Motor Circuit
If OK, continue with next check.

CHECKING DISCHARGE AIR




1. Turn mode control dial to each position.




2. Confirm that discharge air comes out according to the air distribution table. Refer to "Discharge Air Flow".
Mode door position is checked in the next step.

If NG, go to trouble diagnosis procedure for ATC-65, "Mode Door Motor Circuit". Mode Door Motor Circuit
If OK, continue with next check.

NOTE: Confirm that the compressor clutch is engaged (sound or visual inspection) and intake door position is at FRESH when the D/F, D/F2 or DEF position are selected.




CHECKING INTAKE DOOR
1. Press intake switch. Recirculation indicator should illuminate.
2. Press intake switch again. Fresh indicator should illuminate.
3. Listen for intake door position change (you should hear blower sound change slightly).

If NG, go to trouble diagnosis procedure for ATC-72, "Intake Door Motor Circuit". Intake Door Motor Circuit
If OK, continue with next check.




CHECKING TEMPERATURE DECREASE
1. Turn temperature control dial until 18 °C (60 °F).
2. Check for cold air at discharge air outlets.

If NG, go to trouble diagnosis procedure for ATC-87, "Insufficient Cooling". Insufficient Cooling
If OK, continue with next check.




CHECKING TEMPERATURE INCREASE
1. Turn temperature control dial until 32 °C (90 °F).
2. Check for hot air at discharge air outlets.

If NG, go to trouble diagnosis procedure for ATC-94, "Insufficient Heating". Insufficient Heating
If OK, continue with next check.




CHECKING A/C SWITCH
Turn fan control dial to AUTO position. (Compressor is turned ON automatically.)
- Confirm that the compressor clutch engages (sound or visual inspection). (Discharge air and blower speed will depend on ambient, in-vehicle, and set temperatures.)

If NG, go to trouble diagnosis procedure for ATC-59, "Power Supply and Ground Circuit for Auto Amp." , Power Supply and Ground Circuit For Auto Amp. then if necessary, trouble diagnosis procedure for ATC-80, "Magnet Clutch Circuit". Magnet Clutch Circuit

If all operational checks are OK (symptom cannot be duplicated), go to Incident Simulation Tests in GI-27, "How to Perform Efficient Diagnosis for an Electrical Incident" How to Perform Efficient Diagnosis For an Electrical Incidentand perform tests as outlined to simulate driving conditions environment. If symptom appears, refer to "SYMPTOM TABLE" and perform applicable trouble diagnosis procedures.